Black pipe is plain steel pipe without any protective coatings. Black pipe is used for a variety of applications around the home. It is very common to see black pipe used for your natural gas line and sprinkler system lines. Since black pipe has no protective coating, it may rust easily in wet or humid environments. To stop the pipe from rusting or corroding on the outside, you should provide a layer of protection on the outside of the pipe. The easiest method is painting it.

Black pipes (carbon steel pipes without coating treatment) are susceptible to corrosion and other damages because their surfaces are directly exposed to the environment. In order to extend the service life of black pipes and ensure their stable performance, it is very important to take appropriate protective measures. The following are several common protection methods:

1. Surface pretreatment

Cleaning: Before any anti-corrosion treatment, the surface of the black pipe must be thoroughly cleaned to remove impurities such as oil, rust, and scale. Common methods include sandblasting, pickling, and mechanical grinding.

Drying: Ensure that the surface of the steel pipe is completely dry to avoid residual moisture affecting the effect of subsequent treatment.

2. Anti-corrosion coating

Painting: Use paint with good weather resistance and chemical resistance, such as epoxy resin paint, polyurethane paint, etc. This can provide a physical barrier for the black pipe to prevent moisture and oxygen from contacting the metal surface.

Hot-dip galvanizing: The black pipe is immersed in molten zinc liquid to form a uniform and strongly adherent zinc layer. Zinc, as a sacrificial anode, is preferentially oxidized when encountering a corrosive environment, thereby protecting the steel pipe matrix.

Powder coating: Electrostatic spraying technology is used to apply fused epoxy powder or other types of powder coatings, which form a strong and durable protective film after curing.

3PE/3PP coating: For long-distance transmission pipelines, three-layer polyethylene (3PE) or three-layer polypropylene (3PP) composite coatings can be considered. These coatings not only provide excellent corrosion protection, but also have good mechanical strength and weather resistance.

3.Storage and transportation protection

Moisture-proof packaging: During storage and transportation, moisture-proof paper, plastic film and other materials should be used to wrap the black pipes to avoid corrosion caused by humidity.

Support and fixation: Reasonably arrange the stacking method, use wooden pads or other supports to keep the pipes stable, and prevent surface damage caused by collision and friction.